Oval spa seat



FIG. 1 is an upper perspective view of the oval spa seat design, shown in the environment of a spa, the spa being shown in broken lines;

FIG. 2 is a top plan view thereof;

FIG. 3 is a cross-sectional view thereof, taken along line 3-3 of FIG. 2; and,

FIG. 4 is a cross-sectional view thereof, taken along line 4-4 of FIG. 2.

The matter delineated in broken lines forms no part of the claimed ornamental design. 

The ornamental design for an oval spa seat, as substantially shown and described. 